There's a British show (Bargin Hunter?) where 2 teams are given money to by antique items at a flea market (they usually haggle the price down 20-30%) and then see if they can make a profit at an auction the next week. Most of the time they seem to, once in a while even doubling their money on an item. So far so good.

But I keep thinking- why don't those people at the auction go to the flea market themselves and that stuff a lot cheaper than what they're paying for it at the auction??